Science : Ch 11 – The Human Eye and the Colourful World

This test is designed based on NCERT Syllabus for Class 10 Topics : The Human Eye and the Colourful World

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

A clear sky appears blue, because:

blue light gets absorbed in the atmosphere

ultraviolet radiations are absorbed in the atmosphere

violet and blue lights get scattered more than the lights of all other colours by the atmosphere

lights of all other colours is scattered more than the violet and blue colour lights by the atmosphere

2 / 15

Which of the following statements is correct regarding the propagation of light of diferent colours of white light in air?

Red light moves the fastest.

Blue light moves faster than green light

All the colours of the white light travel with the same speed. (d)

Yellow light moves with the mean speed as that of red and the violet light.

3 / 15

Which of the following phenomena contributes signifcantly to the reddish appearance of the sun at sunrise or sunset?

Dispersion of light

Scattering of light

Total internal refection of light

Refection of light from Earth

4 / 15

The absorption of light by a molecule depends on the

wavelength and the size of the molecule

wavelength

size of molecules

none

5 / 15

The sun appears red at sunset or sunrise. Choose the incorrect statement from the following

Light from the sun near the horizon passes through the layers of air.

Light from the sun near the horizon travels larger distance in the earth’s atmosphere before reaching our eyes. (c)

Most of the blue light and longer wavelengths are scattered away by the particles.

Most of the blue light and shorter wavelengths are scattered away by the

6 / 15

Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon,name the phenomeoneon

Atmospheric refraction

Atmospheric reflection

Atmospheric dispersion

none

7 / 15

The splitting of light into its component colours is called

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

8 / 15

Lenses which have both concave and convex structure.

Bifocal lenses

Concave lenses

Difocal lenses

Convex lenses

9 / 15

Astigmatism can be corrected

convex lens

concave lenses

cyclindrical lens

bifocal lens

10 / 15

Rainbow is caused due to

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

11 / 15

A concave lens of short focal length has greater

Converging power than concave lens of long focal length

diverging power than convex lens of long focal length

diverging power than concave lens of long focal length

converging power than convex lens of long focal length

12 / 15

The SI unit of Power of a lens is

Hertz

Dipotre

newton

none

13 / 15

The colour of the clear sky blue due to

refraction of light

scattering of light

reflection of light

Dispersion of light

14 / 15

Visible spectrum is the band of coloured components of a

red light beam

white light beam

blue light beam

black light beam

15 / 15

The refractive index of glass is least for

violet color

red color

blue color

white color

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Science : Ch 11 – The Human Eye and the Colourful World

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